function set_cookie ( name, value, exp_y, exp_m, exp_d, path, domain, secure ) {
var cookie_string = name + "=" + escape ( value );

  if ( exp_y ) {
	    var expires = new Date ( exp_y, exp_m, exp_d );
	    cookie_string += "; expires=" + expires.toGMTString();
  }

  if ( path ) 
        cookie_string += "; path=" + escape ( path );

  if ( domain )
        cookie_string += "; domain=" + escape ( domain );
  
  if ( secure )
        cookie_string += "; secure";
  
  document.cookie = cookie_string;
}

function get_cookie ( cookie_name ) {
var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}

function delete_cookie ( cookie_name ) {
var cookie_date = new Date ( );  // current date & time
	cookie_date.setTime ( cookie_date.getTime() - 1 );
	document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}